Roof Waterproofing in Juneau, Alaska

Roof Waterproofing in Juneau, Alaska

Waterproofing is the layer that stops the rainforest from getting through the roof. In the City and Borough of Juneau, where 90 inches of rain fall a year, waterproofing is the difference between a dry home and a constant leak. Roof waterproofing in Juneau means a full moisture barrier, sealed flashings, and durable membranes on flat sections.

Where Juneau Roofs Need Waterproofing

• The full roof deck — the underlayment that backs the shingles
• Valleys — the channels where the rain flows fast
• Flat and low-slope sections — where water pools and the deck is vulnerable
• Chimney and skylight flashings — the most common leak points
• Vent pipe boots — cracked boots let water in around the pipe

Why Waterproofing Matters in Juneau

The rainforest is the ultimate test of waterproofing. Rain falls nearly every day through much of the year, and the moisture finds every weak point. Without a proper underlayment, the rain works through the shingle joints and into the deck.

The full moisture barrier under the shingles is the workhorse. It backs the shingles and catches any water that gets past them, directing it down the roof instead of into the deck. That’s the difference between a roof that leaks and a roof that holds.

On flat roofs, waterproofing is the whole system. TPO, EPDM, and coating are waterproofing layers that shed the rain and flex with the temperature swings.

How We Waterproof Roofs in Juneau

1. Inspect the roof and leak points — find where water is trying to get in
2. Clean and prep the surface — dry, smooth, and ready for the membrane
3. Install the underlayment — full moisture barrier under the shingles
4. Seal flashings and boots — every edge and penetration sealed
5. Apply coatings if needed — elastomeric coating on flat sections

Roof Waterproofing Costs in Juneau

Service	Typical range	What’s included	Warranty
Full underlayment	$1,000 – $3,000	Moisture barrier, valleys, eaves	5 years
Flashing and boot sealing	$600 – $1,700	Seal every penetration	2 years
Flat roof waterproofing	$3,500 – $9,000	Membrane or coating, sealed	5 years
Full waterproofing package	$5,000 – $12,000	Deck, valleys, flat sections, penetrations	5 years

Preventing Water Damage in Juneau

• Full underlayment at every re-roof — the best investment in a dry home
• Check flashing each spring — re-seal any loose metal
• Keep gutters clear — full gutters push water up under the eave
• Treat the moss — moss holds moisture against the roof surface

Waterproofing note: the rainforest tests every seal. The money spent on the underlayment is the most important money on the roof.

Serving Juneau and Nearby Areas

We waterproof roofs across the City and Borough of Juneau, including downtown, the Mendenhall Valley, Lemon Creek, Douglas Island, and Auke Bay.

FAQ

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Start with a free roof inspection and waterproofing assessment. Call us today for local crews.